Idaho Code § 18-3327: Consistency in Knife regulation.

(1) Except as provided in sections 18-3302 and 18-3302A, Idaho Code, a city, county, or other political subdivision of this state shall not enact any ordinance, rule, or tax relating to the transportation, possession, carrying, sale, transfer, purchase, gift, devise, licensing, registration, or use of a knife or knife making components in this state.

(2) Notwithstanding the provisions of subsection (1) of this section, the following entities may regulate the possession of a knife:

(a) Public schools, including public charter schools;

(b) Any court of record for any courthouse;

(c) All law enforcement facilities;

(d) All places of involuntary confinement, including:

(i) Prisons and jails established pursuant to title 20, Idaho Code; and

(ii) Entities managed and operated pursuant to section 56-203, Idaho Code; and

(e) A city, county, or other political subdivision of the state in order to regulate child care facility safety standards.

(3) A city, county, or other political subdivision of this state shall not enact any rule or ordinance relating to the manufacture of a knife that is more restrictive than any rule or ordinance relating to the manufacture of any other commercial goods.

(4) Except as provided in sections 18-3302 and 18-3302A, Idaho Code, any rule or ordinance of a city, county, or political subdivision of this state that contradicts the provisions of this section shall be null, void, and of no force and effect.